请教一道数学题

legnawen

The surface area of a square tabletop was changed so that one of the dimensions was reduced by 1 inch and the other dimension was increased by 2 inches. What was the surface area before these changes were made?
(1) After the changes were made, the surface area was 70 square inches.
(2) There was a 25 percent increase in one of the dimensions.


A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.

这里的dimension是什么呀, 我只知道有面积和维度的意思, 麻烦能帮我翻译下这道题, 谢谢啦~~

piacia

你可以把维度理解为方向，2维就是两个不同的方向，题目意思就是一个正方形一边减少1，一边增加2
答案D??

JoshwuS

应该是两个边长的意思，一边 短了1，一边 长了2

laurawang2234

这题如果不算，我觉得选E

citidandan

这题如果不算，我觉得选E
laurawang2234 发表于 2011-1-9 21:12

能说下原因么？

chriswendy35

注意square这个条件，就好了，是D